CN101927312A - Method for processing TC4 titanium alloy into forged rings - Google Patents
Method for processing TC4 titanium alloy into forged rings Download PDFInfo
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Abstract
The invention relates to a method for processing TC4 titanium alloy into forged rings, comprising the following steps of: (1) raising the temperature of a titanium cast ingot to 1150-1200 DEG C in a natural gas heating furnace, and keeping the temperature for more than 180 minutes to ensure that the inner temperature and the outer temperature of the whole titanium cast ingot are consistent and uniform; (2) directly processing the titanium cast ingot into a square blank at the deformation rate of 70%-80% by utilizing an oil press; (3) sawing the square blank into small blanks by using a band saw; (4) heating and forging the small blanks for three times by utilizing a resistance heating furnace to form cakes; (5) punching in the centers of the cakes by using a puncher; (6) heating the hollow blanks to 950 DEG C, keeping the temperature for more than120 minutes, and then broaching by using a saddle; and (7) completely annealing at the temperature of 120-200 DEG C by adopting the alpha+beta/beta phase transformation point temperature of 985 DEG C, placing the blanks in the resistance heating furnace at the temperature below 500 DEG C, keeping the temperature of 785 DEG C for 90 minutes, and then cooling in the air. The titanium cast ingot is forged into qualified forged rings by using a reasonable forging process.
Description
Technical field
The invention belongs to the metal material processing technical field, particularly the processing technology of rare precious metal goods.
Background technology
Along with getting more and more that titanium alloy uses, a lot of vitals on many products are substituted by titanium alloy gradually, and that the most frequently used is TC4 (Ti-6Al-4V), and this is that product improves performance, upgrading, the needs of catching up with and surpassing world advanced person.Present titanium ring rolling fabrication technique, substantially all do not guarantee the needs of use: be that firing equipment and temperature can't guarantee on the one hand, what be that technological process works out on the other hand is not quite reasonable, though the ring base size and the surface of forging can reach requirement, mechanical property and tissue and standard-required differ greatly.Particularly organize, original basically β crystal boundary does not all have broken fully, and better also is Widmannstatten structure or wire net tissue, differs greatly from two equiaxed structures of the alpha+beta that requires, and can not use at all.
Summary of the invention
The technical problem that the present invention solves: a kind of TC4 titanium alloy forging-ring processing technology is provided, the titanium ingot casting is forged into qualified forging-ring by rational Forging Technology.
The technical solution used in the present invention: TC4 titanium alloy forging-ring processing technology, implement according to following steps:
(1), the titanium ingot casting is put into gas heating furnace, be warming up to 1150 ℃～1200 ℃ heating, insulation was guaranteed whole titanium ingot casting internal and external temperature consistent and uniform more than 180 minutes;
(2), utilize hydraulic press with the titanium ingot casting through 70～80% deformation rate, directly be split into square billet;
(3), square billet is sawn into the fritter blank with band saw;
(4), the fritter blank after changing forging, three heating of resistance-heated furnace is swaged into cake;
(5), with punching pin in cake centre punching, again that crackle on the endoporus and defective reconditioning is clean;
(6), hollow blank is heated to 950 ℃ and is incubated back saddle forging more than 120 minutes, during reaming, when once forging less than the size that requires, tempering in time, the number of times of tempering requires as far as possible less and the deflection that forges after each tempering must be greater than more than 10%;
(7), adopt under alpha+beta/beta transformation point temperature temperature of 120～200 ℃ below 985 ℃ and do full annealing technology, in resistance-heated furnace, be lower than 500 ℃ of shove charges, 785 ℃ of insulations 90 minutes, air cooling.
Above-mentioned steps (4) is finished like this:
1. alpha+beta/beta transformation point temperature more than 985 ℃ 50～100 ℃, blank is once changed forging with the free air hammer; Blank is put into resistance-heated furnace be heated to 1050 ℃ and with blank pulling, deflection reaches 75%, and will dial blank after long with dividing in the band saw;
2. blank being changed over to alpha+beta/beta transformation point temperature forges below 985 ℃:
A, employing resistance-heated furnace, the precision of resistance-heated furnace aspect temperature control are at ± 5 ℃, and 970 ℃ of insulations of heating-up temperature were done three big and heavy stones three and pulled out more than 120 minutes, and big and heavy stone each time is thick than between 1.5～2, and total deformation ratio reaches 6～7;
B, once more blank heating to 960 ℃ insulation more than 120 minutes, is done three big and heavy stones three again and pulled out;
C, with blank detail sanding polishing, with washing down with clear water after the corrosion of cyanogen fluoric acid, the observation macrostructure should satisfy in the A3 again; If not reaching that this just requires need be with changing forging under the sampling technology more once or several times, till macrostructure is met the demands;
3., again with blank heating to 950 ℃ insulation more than 120 minutes, after doing a big and heavy stone one and pulling out again the big and heavy stone rough forge become cake.
Above-mentioned TC4 titanium alloy forging-ring processing technology, described hydraulic press is 1500 tons of hydraulic presses, and the free air hammer is 1 ton of free air hammer, and resistance-heated furnace is the 110KW resistance-heated furnace.
The present invention's advantage compared with prior art:
1, can produce the titanium alloy ring base that satisfies the service condition needs according to standard-required fully, for the deep processing and the instructions for use of product provides assurance;
2, simple for process, easy to operate;
3, organize and guarantee substantially in the A4 level;
4, the mechanical property measured data is good.
The specific embodiment
Needs according to actual conditions, we need be with the performance of TC4 material on the basis of basic demand, make every effort to adjustment by other composition in the alloy, the mechanical property of lifting material that can be maximum, make material in use can farthest meet or exceed instructions for use, when tensile strength was improved, plasticity did not also reduce.This just need find an optimum range from the chemical composition proportioning aspect of material.We find the scope of only oxygen and iron content by the comparison of following several composition proportion to the material property influence.Take the Φ 50TC4 bar longitudinal test piece of the heterogeneity under the identical fabrication process condition and do detection.
As can be seen, the increase of iron and oxygen element has all improved tensile strength of alloys from the contrast of above data, represents the percentage elongation of plasticity and the contraction percentage of area constantly to reduce simultaneously.And iron and oxygen element be all when higher, though tensile strength of alloys increases to some extent, plasticity obviously reduces.Therefore we adopt the content (both the third proportionings) that improves the content of oxygen and do not increase iron in the one-level titanium sponge according to using needs.So both can satisfy the raising of intensity, and can guarantee the needs of material plasticity simultaneously again.
A kind of embodiment of the present invention is described below.
Forging trimmed size is Φ 252 * Φ 185 * 80, and substance is 8.2Kg, and metallographic structure reaches in the A6 level; The equipment that uses has: 1500 tons of hydraulic presses, 1 ton of free air hammer, gas heating furnace, 110KW resistance-heated furnace; The titanium ingot casting substance 1500Kg that uses, diameter of phi 540mm.For guaranteeing that alloying elements distribution is more even, reduce the appearance of segregation, this titanium ingot casting is through three meltings of gas heating furnace, and the alpha+beta/beta transformation point temperature of this batch TC4 titanium ingot casting is through being measured as 985 ℃.
TC4 titanium alloy forging-ring processing technology, implement according to following steps:
(1), the titanium ingot casting is put into gas heating furnace, be warming up to 1150 ℃～1200 ℃ heating, insulation was guaranteed whole titanium ingot casting internal and external temperature consistent and uniform more than 180 minutes.Titanium ingot casting resistance of deformation is low under this temperature, and the plasticity height is fit to the cogging requirement that the titanium ingot casting adopts big deflection, improves and forges saturating property, sufficient broken as-cast structure;
(2), utilize 1500 tons of hydraulic presses with Φ 540mm titanium ingot casting through 70～80% deformation rate, directly be split into the 240mm square billet.1500 tons of hydraulic presses have the saturating property of good forging, and the production efficiency height is the cogging equipment of the excellence of forged titanium ingot casting, and thick titanium ingot structure at this moment is by preliminary fragmentation, and the outside and centre organize basically identical.
(3), square billet is sawn into the fritter blank of 30Kg substance with band saw, can accomplish good distortion when forging fully and forge saturating degree so that on 1 ton of free air hammer, change.
(4), the fritter blank after changing forging, three heating of resistance-heated furnace is swaged into cake.
1. alpha+beta/beta transformation point temperature more than 985 ℃ 50～100 ℃, blank is once changed forging with 1 ton of free air hammer; To change blank after the forging and put into resistance-heated furnace and be heated to 1050 ℃ and blank pulled out 120mm, deflection reaches 75%, and will dial blank after long with dividing in the band saw.Purpose is to make β phase crystal grain obtain sufficient fragmentation once more, makes α generate nucleus simultaneously between β phase crystal boundary.
2. blank being changed over to alpha+beta/beta transformation point temperature forges below 985 ℃:
A, employing resistance-heated furnace, the precision of resistance-heated furnace aspect temperature control are at ± 5 ℃, and 970 ℃ of insulations of heating-up temperature are more than 120 minutes, doing three big and heavy stones three pulls out, big and heavy stone each time is thick, and total deformation ratio reaches 6～7 than between 1.5～2, and is further tiny evenly with the crystal grain that guarantees material.Purpose is in order to make original β crystal boundary energy access sufficient transformation, simultaneously can make α on the β crystal boundary, continue nucleation, obtain the bifurcation tissue of two district's processing of alpha+beta of excellent performance, this moment is very high to the requirement of the deformation temperature in the process, deformation extent and deformation velocity, these three kinds of factors interact and condition each other, and it is suitable to require to grasp in the process of manufacture of reality.
B, once more blank heating to 960 ℃ insulation more than 120 minutes, is done three big and heavy stones three again and pulled out.Purpose is further refinement even grained tissue.
C, with blank detail sanding polishing, with washing down with clear water after the corrosion of cyanogen fluoric acid, the observation macrostructure should satisfy in the A3 again; If not reaching that this just requires need be with changing forging under the sampling technology more once or several times, till macrostructure is met the demands;
3., again with blank heating to 950 ℃ insulation more than 120 minutes, after doing a big and heavy stone one and pulling out again the big and heavy stone rough forge to become thickness be the cake of 100mm.
(5), with punching pin in the hole that diameter of cake centre punch is Φ 100mm, again that crackle on the endoporus and defective reconditioning is clean.
(6), hollow blank is heated to 950 ℃ and is incubated back saddle forging more than 120 minutes, during reaming, when once forging less than the size that requires, tempering in time, the number of times of tempering requires as far as possible less and the deflection that forges after each tempering must be greater than more than 10%; Requirement speed wants fast during reaming because the heat radiation of hollow blank after coming out of the stove is very fast, be lower than final forging temperature after, the drag of material is huge to be increased, be difficult to forging deformation,, cause material when ultrasonic examination, to exceed standard and scrap if continuing to force to forge to make the inside of material crackle or other defective occur.During reaming simultaneously, when once forging less than the size that requires, tempering in time, the number of times of tempering requires as far as possible little, the temperature of TC4 blank tempering heating is far above its recrystallization temperature, the simultaneous α transformation of β phase in opposite directions of growing up of α phase nucleus can take place in this process, the deflection that forges after therefore each tempering must be greater than more than 10%, otherwise the crystal grain that metallographic structure requires is tiny, evenly will be difficult to guarantee, cause appearing at original sheet β and go up the α phase that thick or strip occur mutually, be commonly called as the basket tissue, cause the tensile strength and the plasticity of material all to reduce, external diameter was concentric in the appearance and size of encircling base simultaneously required to guarantee, blank is added on lathe can be fallen black oxide coating and the whole cars of blemish man-hour, and not allowing has repair welding in the place of defective, and the ring material billet size that this moment, we were swaged into is: Φ 267mm * Φ 170mm * 95mm.
(7), adopt under alpha+beta/beta transformation point temperature temperature of 120～200 ℃ below 985 ℃ and do full annealing technology, in resistance-heated furnace, be lower than 500 ℃ of shove charges, 785 ℃ of insulations 90 minutes, air cooling.Final mechanical property and metallographic structure play crucial effects to forging-ring in the annealing of TC4 titanium alloy, the purpose of alloy material annealing not only can be improved structure property by the crystallization again of crystal grain, and the dissolving that is attended by compound changes with α → β polymorphism mutually, the structural stress that metal inside in the hot and cold processing produces can be released simultaneously, the machined in later stage realizes easily.The crystallization again of α phase only takes place in the such annealing of alpha+beta alloy below transformation temperature for TC4, so the material after the heat treatment still can keep the bifurcation institutional framework of two district's processing of alpha+beta.We adopt under alpha+beta/beta transformation point temperature temperature of 120～200 ℃ below 985 ℃ and do full annealing technology.The microscopic structure of certain combination property that purpose is stable in order to obtain, plasticity is good or corresponding.The crystallization again of α phase mainly takes place in this process.Too high meeting causes unnecessary oxidation and grain growth as temperature.A lot of tests and demonstration have been carried out in research for the TC4 anneal of material in the past, and we just do not do unnecessary trial here, just the achievement of research are directly used in this is produced and just can.The Technology for Heating Processing that we adopt is: in resistance-heated furnace, be lower than 500 ℃ of shove charges, 785 ℃ are incubated 90 minutes, air cooling.
The testing result of forging-ring:
Carrying out flaw detection: the forging-ring after we use supersonic detector to machined detects, with reference to the GB5193 standard, and single reflected signal≤1.2mm, a plurality of reflected signal＜0.8mm, clutter echo signal＜1.2mm meets the A level requirement in the standard.
We respectively get one group of 15 * 15 * Lmm sample along the tangential and short transverse of forging-ring with wire cutting method and send the physics and chemistry center to detect.Detect content room temperature and mechanical behavior under high temperature, mirco structure are arranged.Testing result is as follows: TC4 forging-ring room-temperature mechanical property
The TC4 forging-ring is lasting mechanical behavior under high temperature at 400 ℃, 100 hours:
Conclusion: with reference to the GJB1538 standard, mechanical property has all reached requirement, and metallographic structure is the bifurcation institutional framework of two district's processing of tiny and uniform alpha+beta, and rank judges that in the A4 level, ultrasonic examination detects in the A level.
Claims (3)
1.TC4 titanium alloy forging-ring processing technology is characterized in that implementing according to following steps:
(1), the titanium ingot casting is put into gas heating furnace, be warming up to 1150 ℃～1200 ℃ heating, insulation was guaranteed whole titanium ingot casting internal and external temperature consistent and uniform more than 180 minutes;
(2), utilize hydraulic press with the titanium ingot casting through 70～80% deformation rate, directly be split into square billet;
(3), square billet is sawn into the fritter blank with band saw;
(4), the fritter blank after changing forging, three heating of resistance-heated furnace is swaged into cake;
(5), with punching pin in cake centre punching, again that crackle on the endoporus and defective reconditioning is clean;
(6), hollow blank is heated to 950 ℃ and is incubated back saddle forging more than 120 minutes, during reaming, when once forging less than the size that requires, tempering in time, the number of times of tempering requires as far as possible less and the deflection that forges after each tempering must be greater than more than 10%;
(7), adopt under alpha+beta/beta transformation point temperature temperature of 120～200 ℃ below 985 ℃ and do full annealing technology, in resistance-heated furnace, be lower than 500 ℃ of shove charges, 785 ℃ of insulations 90 minutes, air cooling.
2. TC4 titanium alloy forging-ring processing technology according to claim 1, it is characterized in that: above-mentioned steps (4) is finished like this:
1. alpha+beta/beta transformation point temperature more than 985 ℃ 50～100 ℃, blank is once changed forging with the free air hammer; To change blank after the forging and put into resistance-heated furnace and be heated to 1050 ℃ and with the blank pulling, deflection reaches 75%, and will dial blank after long with dividing in the band saw;
2. blank being changed over to alpha+beta/beta transformation point temperature forges below 985 ℃:
A, employing resistance-heated furnace, the precision of resistance-heated furnace aspect temperature control are at ± 5 ℃, and 970 ℃ of insulations of heating-up temperature were done three big and heavy stones three and pulled out more than 120 minutes, and big and heavy stone each time is thick than between 1.5～2, and total deformation ratio reaches 6～7;
B, once more blank heating to 960 ℃ insulation more than 120 minutes, is done three big and heavy stones three again and pulled out;
C, with blank detail sanding polishing, with washing down with clear water after the corrosion of cyanogen fluoric acid, the observation macrostructure should satisfy in the A3 again; If not reaching that this just requires need be with changing forging under the sampling technology more once or several times, till macrostructure is met the demands;
3., again with blank heating to 950 ℃ insulation more than 120 minutes, after doing a big and heavy stone one and pulling out again the big and heavy stone rough forge become cake.
3. TC4 titanium alloy forging-ring processing technology according to claim 1 and 2 is characterized in that: described hydraulic press is 1500 tons of hydraulic presses, and the free air hammer is 1 ton of free air hammer, and resistance-heated furnace is the 110KW resistance-heated furnace.
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| CN102513479A (en) * | 2011-11-18 | 2012-06-27 | 宝鸡市金盛伟业稀有金属有限公司 | Production process for large-diameter fine isometric crystal tissue titanium alloy bar |
| CN103464987A (en) * | 2013-09-26 | 2013-12-25 | 贵州航宇科技发展股份有限公司 | Manufacturing method of TC4 titanium alloy ring for aero-engine outer duct |
| CN104139141A (en) * | 2014-06-30 | 2014-11-12 | 贵州安大航空锻造有限责任公司 | Equiaxed grain forging forming method for titanium alloy ring piece |
| CN104494808A (en) * | 2014-12-23 | 2015-04-08 | 无锡透平叶片有限公司 | Structure for easily forming titanium alloy forge piece high rib |
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| CN102513479A (en) * | 2011-11-18 | 2012-06-27 | 宝鸡市金盛伟业稀有金属有限公司 | Production process for large-diameter fine isometric crystal tissue titanium alloy bar |
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| CN104139141A (en) * | 2014-06-30 | 2014-11-12 | 贵州安大航空锻造有限责任公司 | Equiaxed grain forging forming method for titanium alloy ring piece |
| CN104494808A (en) * | 2014-12-23 | 2015-04-08 | 无锡透平叶片有限公司 | Structure for easily forming titanium alloy forge piece high rib |
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| CN105112831A (en) * | 2015-09-14 | 2015-12-02 | 沈阳泰恒通用技术有限公司 | Method for preparing BT5-1 titanium alloy ring material used in low-temperature environment |
| CN106563755A (en) * | 2015-10-08 | 2017-04-19 | 陕西宏远航空锻造有限责任公司 | Triangular inner hole crude type structure preparation method for aluminum alloy die forging |
| CN107695629A (en) * | 2017-10-17 | 2018-02-16 | 宝鸡市紫玉金属材料有限公司 | A kind of forging technology of titanium alloy coning sleeve |
| CN107971710A (en) * | 2017-12-27 | 2018-05-01 | 贵州航宇科技发展股份有限公司 | A kind of manufacture method of TA1 materials ring forging |
| CN108435999A (en) * | 2018-05-03 | 2018-08-24 | 奥科宁克航空机件(苏州)有限公司 | A kind of titanium alloy ring forging anti-deformation forging technology |
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| CN112718911B (en) * | 2020-12-11 | 2022-06-17 | 江苏宇钛新材料有限公司 | Preparation method of low-cost titanium alloy thin-wall pipe |
| CN112893760A (en) * | 2021-01-20 | 2021-06-04 | 陕西茂凇新材科技有限公司 | Production process of high-strength Ti75 titanium ring |
| CN112916791A (en) * | 2021-01-20 | 2021-06-08 | 陕西茂凇新材科技有限公司 | Production process of high-strength Ti80 titanium ring |
| CN113510216A (en) * | 2021-03-31 | 2021-10-19 | 西安航天发动机有限公司 | Forging forming method for niobium-tungsten alloy ring-shaped piece |
| CN113878083A (en) * | 2021-09-23 | 2022-01-04 | 中航卓越锻造（无锡）有限公司 | TA1 ring forging and preparation method thereof |
| CN113878083B (en) * | 2021-09-23 | 2024-01-26 | 中航卓越锻造（无锡）有限公司 | TA1 ring forging and preparation method thereof |
| CN114433778A (en) * | 2021-12-15 | 2022-05-06 | 陕西宏远航空锻造有限责任公司 | TC4 (special) titanium alloy forging improving method |
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